remove unneeded lang item

Author: BennoLossin

compiler/rustc_hir/src/lang_items.rs

@@ -448,7 +448,6 @@ language_item_table! {
     UnalignedFieldBase,             sym::UnalignedFieldBase,            unaligned_field_base,             Target::AssocTy,                                      GenericRequirement::None;
     UnalignedFieldType,             sym::UnalignedFieldType,            unaligned_field_type,             Target::AssocTy,                                      GenericRequirement::None;
     UnalignedFieldOFFSET,           sym::UnalignedFieldOFFSET,          unaligned_field_offset,           Target::AssocConst,                                   GenericRequirement::None;
-    UnalignedFieldOffset,           sym::unaligned_field_offset,        unaligned_field_offset_getter,    Target::Fn,                                           GenericRequirement::Exact(1);
 }
 
 /// The requirement imposed on the generics of a lang item

compiler/rustc_middle/src/ty/context.rs

@@ -3478,9 +3478,6 @@ impl<'tcx> TyCtxt<'tcx> {
     pub fn intrinsic(self, def_id: impl IntoQueryParam<DefId> + Copy) -> Option<ty::IntrinsicDef> {
         match self.def_kind(def_id) {
             DefKind::Fn | DefKind::AssocFn => {}
-            DefKind::AssocConst
-                if self.is_lang_item(def_id.into_query_param(), LangItem::UnalignedFieldOFFSET) => {
-            }
             _ => return None,
         }
         self.intrinsic_raw(def_id)

library/core/src/intrinsics/mod.rs

@@ -3324,7 +3324,6 @@ pub unsafe fn va_end(ap: &mut VaListImpl<'_>);
 ///
 /// This is a `const`-only intrinsic that doesn't have any codegen.
 #[rustc_intrinsic]
-#[lang = "unaligned_field_offset"]
 #[unstable(feature = "field_projections", issue = "145383")]
 #[rustc_const_unstable(feature = "field_projections", issue = "145383")]
 pub const fn unaligned_field_offset<F: crate::field::UnalignedField>() -> usize;